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          <span class="refentrytitle">button</span>
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        <p>button — 
      Sense on-screen controls.
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        <h2>Description</h2>
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      Sense on-screen controls. Requires Winsound or TCL/TK.
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        <h2>Syntax</h2>
        <pre class="synopsis">kres <span class="command"><strong>button</strong></span> knum</pre>
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        <h2>Performance</h2>
        <p>
      Note that this opcode is not available on Windows due to the implimentation of pipes on that system 
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        <p>
      <span class="emphasis"><em>kres</em></span> -- value of the button control. If the button has been pushed since the last k-period, then return 1, otherwise return 0. 
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        <p>
      <span class="emphasis"><em>knum</em></span> -- the number of the button. If it does not exist, it is made on-screen at initialization.
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        <h2>See Also</h2>
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        <a class="link" href="checkbox.html" title="checkbox"><em class="citetitle">checkbox</em></a>
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        <h2>Credits</h2>
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            <td>Author: John ffitch</td>
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            <td>University of Bath, Codemist. Ltd.</td>
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            <td>Bath, UK</td>
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            <td>September 2000</td>
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        <p>New in Csound version 4.08</p>
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